package com.nowcoder.community.entity;

/**
 * 封装分页相关的信息
 * @author ProgramCat
 * @date 2023/3/25 21:29
 */
public class Page {
    //当前页数
    private int current=1;
    //显示上限
    private int limit=10;
    //数据总数（用于计算总数）
    private int rows;
    //查询路径（用于复用分页链接）
    private String path;

    public int getCurrent() {
        return current;
    }

    public void setCurrent(int current) {
        if(current>=1){
            this.current = current;
        }
    }

    public int getLimit() {
        return limit;
    }

    public void setLimit(int limit) {
        if (limit>=1&&limit<=100){
            this.limit = limit;
        }
    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
        if (rows>=0){
            this.rows = rows;
        }
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }
    /**
     *
     * @author ProgramCat
     * @date 2023/3/25 22:10
     获取起始页
     * @return int 起始页
     */
    public int getOffset() {
        // current * limit - limit
        return (current - 1) * limit;
    }
    /**
     *获取总页数
     * 即rows/limit，有余数则加一
     * @author ProgramCat
     * @date 2023/3/25 21:34
     */
    public int getTotal(){
        if (rows%limit==0){
            return rows/limit;
        }else{
            return rows/limit +1;
        }
    }
    /**
     * @author ProgramCat
     * @date 2023/3/25 21:38
     *获取起始页码
     * @return int 始页码
     */
    public int getFrom(){
        int from=current-2;
        return from<1?1:from;
    }
    /**
     *
     * @author ProgramCat
     * @date 2023/3/25 21:38
     * 获取结束页
     * @return int 结束页
     */
    public int getTo() {
        int to = current + 2;
        int total = getTotal();
        return to > total ? total : to;
    }
}
